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gstreamer/ext/assrender/gstassrender.c
Grigori Goronzy 934c91682f assrender: instruct libass to use light autohinting 
Fixes bug #608753.
2010-02-02 08:55:59 +01:00

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/*
* Copyright (c) 2008 Benjamin Schmitz <vortex@wolpzone.de>
* Copyright (c) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-assrender
*
* Renders timestamped SSA/ASS subtitles on top of a video stream.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v filesrc location=/path/to/mkv ! matroskademux name=d ! queue ! mp3parse ! mad ! audioconvert ! autoaudiosink d. ! queue ! ffdec_h264 ! ffmpegcolorspace ! r. d. ! queue ! "application/x-ass" ! assrender name=r ! ffmpegcolorspace ! autovideosink
* ]| This pipeline demuxes a Matroska file with h.264 video, MP3 audio and embedded ASS subtitles and renders the subtitles on top of the video.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstassrender.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_ass_render_debug);
GST_DEBUG_CATEGORY_STATIC (gst_ass_render_lib_debug);
#define GST_CAT_DEFAULT gst_ass_render_debug
/* Filter signals and props */
enum
{
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ENABLE,
PROP_EMBEDDEDFONTS
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR ";"
GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx ";"
GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate video_sink_factory =
GST_STATIC_PAD_TEMPLATE ("video_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR ";"
GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx ";"
GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate text_sink_factory =
GST_STATIC_PAD_TEMPLATE ("text_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-ass; application/x-ssa")
);
static void gst_ass_render_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ass_render_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ass_render_finalize (GObject * object);
static GstStateChangeReturn gst_ass_render_change_state (GstElement * element,
GstStateChange transition);
GST_BOILERPLATE (GstAssRender, gst_ass_render, GstElement, GST_TYPE_ELEMENT);
static GstCaps *gst_ass_render_getcaps (GstPad * pad);
static gboolean gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps);
static gboolean gst_ass_render_setcaps_text (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_ass_render_chain_video (GstPad * pad, GstBuffer * buf);
static GstFlowReturn gst_ass_render_chain_text (GstPad * pad, GstBuffer * buf);
static gboolean gst_ass_render_event_video (GstPad * pad, GstEvent * event);
static gboolean gst_ass_render_event_text (GstPad * pad, GstEvent * event);
static gboolean gst_ass_render_event_src (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_ass_render_bufferalloc_video (GstPad * pad,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buffer);
static gboolean gst_ass_render_query_src (GstPad * pad, GstQuery * query);
static void
gst_ass_render_base_init (gpointer gclass)
{
GstElementClass *element_class = (GstElementClass *) gclass;
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&video_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&text_sink_factory));
gst_element_class_set_details_simple (element_class, "ASS/SSA Render",
"Mixer/Video/Overlay/Subtitle",
"Renders ASS/SSA subtitles with libass",
"Benjamin Schmitz <vortex@wolpzone.de>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
/* initialize the plugin's class */
static void
gst_ass_render_class_init (GstAssRenderClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_ass_render_set_property;
gobject_class->get_property = gst_ass_render_get_property;
gobject_class->finalize = gst_ass_render_finalize;
g_object_class_install_property (gobject_class, PROP_ENABLE,
g_param_spec_boolean ("enable", "Enable",
"Enable rendering of subtitles", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_EMBEDDEDFONTS,
g_param_spec_boolean ("embeddedfonts", "Embedded Fonts",
"Extract and use fonts embedded in the stream", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_ass_render_change_state);
}
#if defined(LIBASS_VERSION) && LIBASS_VERSION >= 0x00907000
static void
_libass_message_cb (gint level, const gchar * fmt, va_list args, gpointer data)
{
GstAssRender *render = GST_ASS_RENDER (data);
gchar *message = g_strdup_vprintf (fmt, args);
if (level < 2)
GST_CAT_ERROR_OBJECT (gst_ass_render_lib_debug, render, message);
else if (level < 4)
GST_CAT_WARNING_OBJECT (gst_ass_render_lib_debug, render, message);
else if (level < 5)
GST_CAT_INFO_OBJECT (gst_ass_render_lib_debug, render, message);
else if (level < 6)
GST_CAT_DEBUG_OBJECT (gst_ass_render_lib_debug, render, message);
else
GST_CAT_LOG_OBJECT (gst_ass_render_lib_debug, render, message);
g_free (message);
}
#endif
static void
gst_ass_render_init (GstAssRender * render, GstAssRenderClass * gclass)
{
GST_DEBUG_OBJECT (render, "init");
render->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
render->video_sinkpad =
gst_pad_new_from_static_template (&video_sink_factory, "video_sink");
render->text_sinkpad =
gst_pad_new_from_static_template (&text_sink_factory, "text_sink");
gst_pad_set_setcaps_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_setcaps_video));
gst_pad_set_setcaps_function (render->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_setcaps_text));
gst_pad_set_getcaps_function (render->srcpad,
GST_DEBUG_FUNCPTR (gst_ass_render_getcaps));
gst_pad_set_getcaps_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_getcaps));
gst_pad_set_chain_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_chain_video));
gst_pad_set_chain_function (render->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_chain_text));
gst_pad_set_event_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_video));
gst_pad_set_event_function (render->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_text));
gst_pad_set_event_function (render->srcpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_src));
gst_pad_set_bufferalloc_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_bufferalloc_video));
gst_pad_set_query_function (render->srcpad,
GST_DEBUG_FUNCPTR (gst_ass_render_query_src));
gst_element_add_pad (GST_ELEMENT (render), render->srcpad);
gst_element_add_pad (GST_ELEMENT (render), render->video_sinkpad);
gst_element_add_pad (GST_ELEMENT (render), render->text_sinkpad);
render->width = 0;
render->height = 0;
render->subtitle_mutex = g_mutex_new ();
render->subtitle_cond = g_cond_new ();
render->renderer_init_ok = FALSE;
render->track_init_ok = FALSE;
render->enable = TRUE;
render->embeddedfonts = TRUE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
render->ass_library = ass_library_init ();
#if defined(LIBASS_VERSION) && LIBASS_VERSION >= 0x00907000
ass_set_message_cb (render->ass_library, _libass_message_cb, render);
#endif
ass_set_extract_fonts (render->ass_library, 1);
render->ass_renderer = ass_renderer_init (render->ass_library);
if (!render->ass_renderer) {
GST_WARNING_OBJECT (render, "cannot create renderer instance");
g_assert_not_reached ();
}
render->ass_track = NULL;
GST_DEBUG_OBJECT (render, "init complete");
}
static void
gst_ass_render_finalize (GObject * object)
{
GstAssRender *render = GST_ASS_RENDER (object);
if (render->subtitle_mutex)
g_mutex_free (render->subtitle_mutex);
if (render->subtitle_cond)
g_cond_free (render->subtitle_cond);
if (render->ass_track) {
ass_free_track (render->ass_track);
}
if (render->ass_renderer) {
ass_renderer_done (render->ass_renderer);
}
if (render->ass_library) {
ass_library_done (render->ass_library);
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_ass_render_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAssRender *render = GST_ASS_RENDER (object);
switch (prop_id) {
case PROP_ENABLE:
render->enable = g_value_get_boolean (value);
break;
case PROP_EMBEDDEDFONTS:
render->embeddedfonts = g_value_get_boolean (value);
ass_set_extract_fonts (render->ass_library, render->embeddedfonts);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ass_render_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAssRender *render = GST_ASS_RENDER (object);
switch (prop_id) {
case PROP_ENABLE:
g_value_set_boolean (value, render->enable);
break;
case PROP_EMBEDDEDFONTS:
g_value_set_boolean (value, render->embeddedfonts);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_ass_render_change_state (GstElement * element, GstStateChange transition)
{
GstAssRender *render = GST_ASS_RENDER (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
render->subtitle_flushing = FALSE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
break;
case GST_STATE_CHANGE_NULL_TO_READY:
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
default:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
g_mutex_lock (render->subtitle_mutex);
render->subtitle_flushing = TRUE;
if (render->subtitle_pending)
gst_buffer_unref (render->subtitle_pending);
render->subtitle_pending = NULL;
g_cond_signal (render->subtitle_cond);
g_mutex_unlock (render->subtitle_mutex);
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (render->ass_track)
ass_free_track (render->ass_track);
render->ass_track = NULL;
render->track_init_ok = FALSE;
render->renderer_init_ok = FALSE;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
}
static gboolean
gst_ass_render_query_src (GstPad * pad, GstQuery * query)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
gboolean ret;
ret = gst_pad_peer_query (render->video_sinkpad, query);
gst_object_unref (render);
return ret;
}
static gboolean
gst_ass_render_event_src (GstPad * pad, GstEvent * event)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
GstSeekFlags flags;
GST_DEBUG_OBJECT (render, "seek received, driving from here");
gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
/* Flush downstream, only for flushing seek */
if (flags & GST_SEEK_FLAG_FLUSH)
gst_pad_push_event (render->srcpad, gst_event_new_flush_start ());
/* Mark subtitle as flushing, unblocks chains */
g_mutex_lock (render->subtitle_mutex);
if (render->subtitle_pending)
gst_buffer_unref (render->subtitle_pending);
render->subtitle_pending = NULL;
render->subtitle_flushing = TRUE;
g_cond_signal (render->subtitle_cond);
g_mutex_unlock (render->subtitle_mutex);
/* Seek on each sink pad */
gst_event_ref (event);
ret = gst_pad_push_event (render->video_sinkpad, event);
if (ret) {
ret = gst_pad_push_event (render->text_sinkpad, event);
} else {
gst_event_unref (event);
}
break;
}
default:
gst_event_ref (event);
ret = gst_pad_push_event (render->video_sinkpad, event);
gst_pad_push_event (render->text_sinkpad, event);
break;
}
gst_object_unref (render);
return ret;
}
static GstCaps *
gst_ass_render_getcaps (GstPad * pad)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
GstPad *otherpad;
GstCaps *caps;
if (pad == render->srcpad)
otherpad = render->video_sinkpad;
else
otherpad = render->srcpad;
/* we can do what the peer can */
caps = gst_pad_peer_get_caps (otherpad);
if (caps) {
GstCaps *temp;
const GstCaps *templ;
/* filtered against our padtemplate */
templ = gst_pad_get_pad_template_caps (otherpad);
temp = gst_caps_intersect (caps, templ);
gst_caps_unref (caps);
/* this is what we can do */
caps = temp;
} else {
/* no peer, our padtemplate is enough then */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
gst_object_unref (render);
return caps;
}
#define CREATE_RGB_BLIT_FUNCTION(name,bpp,R,G,B) \
static void \
blit_##name (GstAssRender * render, ASS_Image * ass_image, GstBuffer * buffer) \
{ \
guint counter = 0; \
gint alpha, r, g, b, k; \
const guint8 *src; \
guint8 *dst; \
gint x, y, w, h; \
gint width = render->width; \
gint height = render->height; \
gint dst_stride = GST_ROUND_UP_4 (width * bpp); \
gint dst_skip; \
gint src_stride, src_skip; \
\
while (ass_image) { \
if (ass_image->dst_y > height || ass_image->dst_x > width) \
goto next; \
\
/* blend subtitles onto the video frame */ \
alpha = 255 - ((ass_image->color) & 0xff); \
r = ((ass_image->color) >> 24) & 0xff; \
g = ((ass_image->color) >> 16) & 0xff; \
b = ((ass_image->color) >> 8) & 0xff; \
src = ass_image->bitmap; \
dst = buffer->data + ass_image->dst_y * dst_stride + ass_image->dst_x * bpp; \
\
w = MIN (ass_image->w, width - ass_image->dst_x); \
h = MIN (ass_image->h, height - ass_image->dst_y); \
src_stride = ass_image->stride; \
src_skip = ass_image->stride - w; \
dst_skip = dst_stride - w * bpp; \
\
for (y = 0; y < h; y++) { \
for (x = 0; x < w; x++) { \
k = src[0] * alpha / 255; \
dst[R] = (k * r + (255 - k) * dst[R]) / 255; \
dst[G] = (k * g + (255 - k) * dst[G]) / 255; \
dst[B] = (k * b + (255 - k) * dst[B]) / 255; \
src++; \
dst += bpp; \
} \
src += src_skip; \
dst += dst_skip; \
} \
next: \
counter++; \
ass_image = ass_image->next; \
} \
GST_LOG_OBJECT (render, "amount of rendered ass_image: %u", counter); \
}
CREATE_RGB_BLIT_FUNCTION (rgb, 3, 0, 1, 2);
CREATE_RGB_BLIT_FUNCTION (bgr, 3, 2, 1, 0);
CREATE_RGB_BLIT_FUNCTION (xrgb, 4, 1, 2, 3);
CREATE_RGB_BLIT_FUNCTION (xbgr, 4, 3, 2, 1);
CREATE_RGB_BLIT_FUNCTION (rgbx, 4, 0, 1, 2);
CREATE_RGB_BLIT_FUNCTION (bgrx, 4, 2, 1, 0);
#undef CREATE_RGB_BLIT_FUNCTION
static inline gint
rgb_to_y (gint r, gint g, gint b)
{
gint ret;
ret = (gint) (((19595 * r) >> 16) + ((38470 * g) >> 16) + ((7471 * b) >> 16));
ret = CLAMP (ret, 0, 255);
return ret;
}
static inline gint
rgb_to_u (gint r, gint g, gint b)
{
gint ret;
ret =
(gint) (-((11059 * r) >> 16) - ((21709 * g) >> 16) + ((32768 * b) >> 16) +
128);
ret = CLAMP (ret, 0, 255);
return ret;
}
static inline gint
rgb_to_v (gint r, gint g, gint b)
{
gint ret;
ret =
(gint) (((32768 * r) >> 16) - ((27439 * g) >> 16) - ((5329 * b) >> 16) +
128);
ret = CLAMP (ret, 0, 255);
return ret;
}
static void
blit_i420 (GstAssRender * render, ASS_Image * ass_image, GstBuffer * buffer)
{
guint counter = 0;
gint alpha, r, g, b, k, k2;
gint Y, U, V;
const guint8 *src;
guint8 *dst_y, *dst_u, *dst_v;
gint x, y, w, h;
gint w2, h2;
gint width = render->width;
gint height = render->height;
gint src_stride;
gint y_offset, y_height, y_width, y_stride;
gint u_offset, u_height, u_width, u_stride;
gint v_offset, v_height, v_width, v_stride;
y_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0, width,
height);
u_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1, width,
height);
v_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2, width,
height);
y_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 0, height);
u_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 1, height);
v_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 2, height);
y_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 0, width);
u_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 1, width);
v_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 2, width);
y_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
u_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);
v_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 2, width);
while (ass_image) {
if (ass_image->dst_y > height || ass_image->dst_x > width)
goto next;
/* blend subtitles onto the video frame */
alpha = 255 - ((ass_image->color) & 0xff);
r = ((ass_image->color) >> 24) & 0xff;
g = ((ass_image->color) >> 16) & 0xff;
b = ((ass_image->color) >> 8) & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
w = MIN (ass_image->w, width - ass_image->dst_x);
h = MIN (ass_image->h, height - ass_image->dst_y);
w2 = (w + 1) / 2;
h2 = (h + 1) / 2;
src_stride = ass_image->stride;
src = ass_image->bitmap;
dst_y =
buffer->data + y_offset + ass_image->dst_y * y_stride +
ass_image->dst_x;
dst_u =
buffer->data + u_offset + ((ass_image->dst_y + 1) / 2) * u_stride +
(ass_image->dst_x + 1) / 2;
dst_v =
buffer->data + v_offset + ((ass_image->dst_y + 1) / 2) * v_stride +
(ass_image->dst_x + 1) / 2;
for (y = 0; y < h - 1; y += 2) {
for (x = 0; x < w - 1; x += 2) {
k = src[0] * alpha / 255;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
k = src[1] * alpha / 255;
k2 += k;
dst_y[1] = (k * Y + (255 - k) * dst_y[1]) / 255;
src += src_stride;
dst_y += y_stride;
k = src[0] * alpha / 255;
k2 += k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
k = src[1] * alpha / 255;
k2 += k;
dst_y[1] = (k * Y + (255 - k) * dst_y[1]) / 255;
k2 /= 4;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
src += -src_stride + 2;
dst_y += -y_stride + 2;
}
if (x < w) {
k = src[0] * alpha / 255;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
src += src_stride;
dst_y += y_stride;
k = src[0] * alpha / 255;
k2 += k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
k2 /= 2;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
src += -src_stride + 1;
dst_y += -y_stride + 1;
}
src += src_stride + (src_stride - w);
dst_y += y_stride + (y_stride - w);
dst_u += u_stride - w2;
dst_v += v_stride - w2;
}
if (y < h) {
for (x = 0; x < w - 1; x += 2) {
k = src[0] * alpha / 255;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
k = src[1] * alpha / 255;
k2 += k;
dst_y[1] = (k * Y + (255 - k) * dst_y[1]) / 255;
k2 /= 2;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
src += 2;
dst_y += 2;
}
if (x < w) {
k = src[0] * alpha / 255;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
}
}
next:
counter++;
ass_image = ass_image->next;
}
GST_LOG_OBJECT (render, "amount of rendered ass_image: %u", counter);
}
static gboolean
gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
gboolean ret = FALSE;
gint par_n = 1, par_d = 1;
gdouble dar;
render->width = 0;
render->height = 0;
if (!gst_video_format_parse_caps (caps, &render->format, &render->width,
&render->height) ||
!gst_video_parse_caps_framerate (caps, &render->fps_n, &render->fps_d)) {
GST_ERROR_OBJECT (render, "Can't parse caps: %" GST_PTR_FORMAT, caps);
ret = FALSE;
goto out;
}
gst_video_parse_caps_pixel_aspect_ratio (caps, &par_n, &par_d);
ret = gst_pad_set_caps (render->srcpad, caps);
if (!ret)
goto out;
switch (render->format) {
case GST_VIDEO_FORMAT_RGB:
render->blit = blit_rgb;
break;
case GST_VIDEO_FORMAT_BGR:
render->blit = blit_bgr;
break;
case GST_VIDEO_FORMAT_xRGB:
render->blit = blit_xrgb;
break;
case GST_VIDEO_FORMAT_xBGR:
render->blit = blit_xbgr;
break;
case GST_VIDEO_FORMAT_RGBx:
render->blit = blit_rgbx;
break;
case GST_VIDEO_FORMAT_BGRx:
render->blit = blit_bgrx;
break;
case GST_VIDEO_FORMAT_I420:
render->blit = blit_i420;
break;
default:
ret = FALSE;
goto out;
}
ass_set_frame_size (render->ass_renderer, render->width, render->height);
dar = (((gdouble) par_n) * ((gdouble) render->width))
/ (((gdouble) par_d) * ((gdouble) render->height));
#if !defined(LIBASS_VERSION) || LIBASS_VERSION < 0x00907000
ass_set_aspect_ratio (render->ass_renderer, dar);
#else
ass_set_aspect_ratio (render->ass_renderer,
dar, ((gdouble) render->width) / ((gdouble) render->height));
#endif
ass_set_font_scale (render->ass_renderer, 1.0);
ass_set_hinting (render->ass_renderer, ASS_HINTING_LIGHT);
#if !defined(LIBASS_VERSION) || LIBASS_VERSION < 0x00907000
ass_set_fonts (render->ass_renderer, "Arial", "sans-serif");
ass_set_fonts (render->ass_renderer, NULL, "Sans");
#else
ass_set_fonts (render->ass_renderer, "Arial", "sans-serif", 1, NULL, 1);
ass_set_fonts (render->ass_renderer, NULL, "Sans", 1, NULL, 1);
#endif
ass_set_margins (render->ass_renderer, 0, 0, 0, 0);
ass_set_use_margins (render->ass_renderer, 0);
render->renderer_init_ok = TRUE;
GST_DEBUG_OBJECT (render, "ass renderer setup complete");
out:
gst_object_unref (render);
return ret;
}
static gboolean
gst_ass_render_setcaps_text (GstPad * pad, GstCaps * caps)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
GstStructure *structure;
const GValue *value;
GstBuffer *priv;
gchar *codec_private;
guint codec_private_size;
gboolean ret = FALSE;
structure = gst_caps_get_structure (caps, 0);
GST_DEBUG_OBJECT (render, "text pad linked with caps: %" GST_PTR_FORMAT,
caps);
value = gst_structure_get_value (structure, "codec_data");
if (value != NULL) {
priv = gst_value_get_buffer (value);
g_return_val_if_fail (priv != NULL, FALSE);
codec_private = (gchar *) GST_BUFFER_DATA (priv);
codec_private_size = GST_BUFFER_SIZE (priv);
if (!render->ass_track)
render->ass_track = ass_new_track (render->ass_library);
ass_process_codec_private (render->ass_track,
codec_private, codec_private_size);
GST_DEBUG_OBJECT (render, "ass track created");
render->track_init_ok = TRUE;
ret = TRUE;
} else if (!render->ass_track) {
render->ass_track = ass_new_track (render->ass_library);
ret = TRUE;
}
gst_object_unref (render);
return ret;
}
static void
gst_ass_render_process_text (GstAssRender * render, GstBuffer * buffer,
GstClockTime running_time, GstClockTime duration)
{
gchar *data = (gchar *) GST_BUFFER_DATA (buffer);
guint size = GST_BUFFER_SIZE (buffer);
gdouble pts_start, pts_end;
pts_start = running_time;
pts_start /= GST_MSECOND;
pts_end = duration;
pts_end /= GST_MSECOND;
GST_DEBUG_OBJECT (render,
"Processing subtitles with running time %" GST_TIME_FORMAT
" and duration %" GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (duration));
ass_process_chunk (render->ass_track, data, size, pts_start, pts_end);
gst_buffer_unref (buffer);
}
static GstFlowReturn
gst_ass_render_bufferalloc_video (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buffer)
{
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
GstFlowReturn ret = GST_FLOW_WRONG_STATE;
GstPad *allocpad;
GST_OBJECT_LOCK (render);
allocpad = render->srcpad ? gst_object_ref (render->srcpad) : NULL;
GST_OBJECT_UNLOCK (render);
if (allocpad) {
ret = gst_pad_alloc_buffer (allocpad, offset, size, caps, buffer);
gst_object_unref (allocpad);
}
gst_object_unref (render);
return ret;
}
static GstFlowReturn
gst_ass_render_chain_video (GstPad * pad, GstBuffer * buffer)
{
GstAssRender *render = GST_ASS_RENDER (GST_PAD_PARENT (pad));
GstFlowReturn ret = GST_FLOW_OK;
gboolean in_seg = FALSE;
gint64 start, stop, clip_start = 0, clip_stop = 0;
ASS_Image *ass_image;
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
GST_WARNING_OBJECT (render, "buffer without timestamp, discarding");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
/* ignore buffers that are outside of the current segment */
start = GST_BUFFER_TIMESTAMP (buffer);
if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
stop = GST_CLOCK_TIME_NONE;
} else {
stop = start + GST_BUFFER_DURATION (buffer);
}
/* segment_clip() will adjust start unconditionally to segment_start if
* no stop time is provided, so handle this ourselves */
if (stop == GST_CLOCK_TIME_NONE && start < render->video_segment.start)
goto out_of_segment;
in_seg =
gst_segment_clip (&render->video_segment, GST_FORMAT_TIME, start, stop,
&clip_start, &clip_stop);
if (!in_seg)
goto out_of_segment;
/* if the buffer is only partially in the segment, fix up stamps */
if (clip_start != start || (stop != -1 && clip_stop != stop)) {
GST_DEBUG_OBJECT (render, "clipping buffer timestamp/duration to segment");
buffer = gst_buffer_make_metadata_writable (buffer);
GST_BUFFER_TIMESTAMP (buffer) = clip_start;
if (stop != -1)
GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
}
gst_segment_set_last_stop (&render->video_segment, GST_FORMAT_TIME,
clip_start);
g_mutex_lock (render->subtitle_mutex);
if (render->subtitle_pending) {
GstClockTime sub_running_time, vid_running_time;
GstClockTime sub_running_time_end, vid_running_time_end;
sub_running_time =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (render->subtitle_pending));
sub_running_time_end =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (render->subtitle_pending) +
GST_BUFFER_DURATION (render->subtitle_pending));
vid_running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer));
vid_running_time_end =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer));
if (sub_running_time <= vid_running_time_end) {
gst_ass_render_process_text (render, render->subtitle_pending,
sub_running_time, sub_running_time_end - sub_running_time);
render->subtitle_pending = NULL;
g_cond_signal (render->subtitle_cond);
} else if (sub_running_time_end < vid_running_time) {
gst_buffer_unref (render->subtitle_pending);
GST_DEBUG_OBJECT (render,
"Too late text buffer, dropping (%" GST_TIME_FORMAT " < %"
GST_TIME_FORMAT, GST_TIME_ARGS (sub_running_time_end),
GST_TIME_ARGS (vid_running_time));
render->subtitle_pending = NULL;
g_cond_signal (render->subtitle_cond);
}
}
g_mutex_unlock (render->subtitle_mutex);
/* now start rendering subtitles, if all conditions are met */
if (render->renderer_init_ok && render->track_init_ok && render->enable) {
GstClockTime running_time;
gdouble timestamp;
#ifndef GST_DISABLE_GST_DEBUG
gdouble step;
#endif
running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer));
GST_DEBUG_OBJECT (render,
"rendering frame for running time %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time));
/* libass needs timestamps in ms */
timestamp = running_time / GST_MSECOND;
#ifndef GST_DISABLE_GST_DEBUG
/* only for testing right now. could possibly be used for optimizations? */
step = ass_step_sub (render->ass_track, timestamp, 1);
GST_DEBUG_OBJECT (render, "Current running time: %" GST_TIME_FORMAT
" // Next event: %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time), GST_TIME_ARGS (step * GST_MSECOND));
#endif
/* not sure what the last parameter to this call is for (detect_change) */
ass_image = ass_render_frame (render->ass_renderer, render->ass_track,
timestamp, NULL);
if (ass_image != NULL) {
buffer = gst_buffer_make_writable (buffer);
render->blit (render, ass_image, buffer);
} else {
GST_LOG_OBJECT (render, "nothing to render right now");
}
} else {
GST_LOG_OBJECT (render, "rendering disabled, doing buffer passthrough");
}
ret = gst_pad_push (render->srcpad, buffer);
return ret;
out_of_segment:
{
GST_DEBUG_OBJECT (render, "buffer out of segment, discarding");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_ass_render_chain_text (GstPad * pad, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstAssRender *render = GST_ASS_RENDER (GST_PAD_PARENT (pad));
GstClockTime timestamp, duration;
GstClockTime sub_running_time, vid_running_time;
GstClockTime sub_running_time_end;
if (render->subtitle_flushing) {
gst_buffer_unref (buffer);
return GST_FLOW_WRONG_STATE;
}
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (timestamp)
|| !GST_CLOCK_TIME_IS_VALID (duration))) {
GST_WARNING_OBJECT (render,
"Text buffer without valid timestamp" " or duration, dropping");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
gst_segment_set_last_stop (&render->subtitle_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer));
sub_running_time =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
timestamp);
sub_running_time_end =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
timestamp + duration);
vid_running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
render->video_segment.last_stop);
if (render->fps_n && render->fps_d)
vid_running_time +=
gst_util_uint64_scale (GST_SECOND, render->fps_d, render->fps_n);
if (sub_running_time > vid_running_time) {
g_assert (render->subtitle_pending == NULL);
g_mutex_lock (render->subtitle_mutex);
if (G_UNLIKELY (render->subtitle_flushing)) {
GST_DEBUG_OBJECT (render, "Text pad flushing");
gst_object_unref (buffer);
g_mutex_unlock (render->subtitle_mutex);
return GST_FLOW_WRONG_STATE;
}
GST_DEBUG_OBJECT (render,
"Too early text buffer, waiting (%" GST_TIME_FORMAT " > %"
GST_TIME_FORMAT, GST_TIME_ARGS (sub_running_time),
GST_TIME_ARGS (vid_running_time));
render->subtitle_pending = buffer;
g_cond_wait (render->subtitle_cond, render->subtitle_mutex);
g_mutex_unlock (render->subtitle_mutex);
} else if (sub_running_time_end < vid_running_time) {
GST_DEBUG_OBJECT (render,
"Too late text buffer, dropping (%" GST_TIME_FORMAT " < %"
GST_TIME_FORMAT, GST_TIME_ARGS (sub_running_time_end),
GST_TIME_ARGS (vid_running_time));
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
} else {
gst_ass_render_process_text (render, buffer, sub_running_time,
sub_running_time_end - sub_running_time);
ret = GST_FLOW_OK;
}
GST_DEBUG_OBJECT (render,
"processed text packet with timestamp %" GST_TIME_FORMAT
" and duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
return ret;
}
static void
gst_ass_render_handle_tags (GstAssRender * render, GstTagList * taglist)
{
static const gchar *mimetypes[] = {
"application/x-font-ttf",
"application/x-font-otf",
"application/x-truetype-font"
};
static const gchar *extensions[] = {
".otf",
".ttf"
};
guint tag_size;
guint index;
if (!taglist)
return;
tag_size = gst_tag_list_get_tag_size (taglist, GST_TAG_ATTACHMENT);
if (tag_size > 0 && render->embeddedfonts) {
const GValue *value;
GstBuffer *buf;
GstCaps *caps;
GstStructure *structure;
gboolean valid_mimetype, valid_extension;
guint j;
const gchar *filename;
GST_DEBUG_OBJECT (render, "TAG event has attachments");
for (index = 0; index < tag_size; index++) {
value = gst_tag_list_get_value_index (taglist, GST_TAG_ATTACHMENT, index);
buf = gst_value_get_buffer (value);
if (!buf || !GST_BUFFER_CAPS (buf))
continue;
caps = GST_BUFFER_CAPS (buf);
structure = gst_caps_get_structure (caps, 0);
valid_mimetype = FALSE;
valid_extension = FALSE;
for (j = 0; j < G_N_ELEMENTS (mimetypes); j++) {
if (gst_structure_has_name (structure, mimetypes[j])) {
valid_mimetype = TRUE;
break;
}
}
filename = gst_structure_get_string (structure, "filename");
if (!filename)
continue;
if (!valid_mimetype) {
guint len = strlen (filename);
const gchar *extension = filename + len - 4;
for (j = 0; j < G_N_ELEMENTS (extensions); j++) {
if (g_ascii_strcasecmp (extension, extensions[j]) == 0) {
valid_extension = TRUE;
break;
}
}
}
if (valid_mimetype || valid_extension) {
ass_add_font (render->ass_library, (gchar *) filename,
(gchar *) GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
GST_DEBUG_OBJECT (render, "registered new font %s", filename);
}
}
}
}
static gboolean
gst_ass_render_event_video (GstPad * pad, GstEvent * event)
{
gboolean ret = FALSE;
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "received video event %s",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate;
gint64 start, stop, time;
gboolean update;
GST_DEBUG_OBJECT (render, "received new segment");
gst_event_parse_new_segment (event, &update, &rate, &format, &start,
&stop, &time);
if (format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (render, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT,
&render->video_segment);
gst_segment_set_newsegment (&render->video_segment, update, rate,
format, start, stop, time);
GST_DEBUG_OBJECT (render, "VIDEO SEGMENT after: %" GST_SEGMENT_FORMAT,
&render->video_segment);
ret = gst_pad_push_event (render->srcpad, event);
} else {
GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL),
("received non-TIME newsegment event on video input"));
ret = FALSE;
gst_event_unref (event);
}
break;
}
case GST_EVENT_TAG:
{
GstTagList *taglist = NULL;
/* tag events may contain attachments which might be fonts */
GST_DEBUG_OBJECT (render, "got TAG event");
gst_event_parse_tag (event, &taglist);
gst_ass_render_handle_tags (render, taglist);
ret = gst_pad_push_event (render->srcpad, event);
break;
}
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
default:
ret = gst_pad_push_event (render->srcpad, event);
break;
}
gst_object_unref (render);
return ret;
}
static gboolean
gst_ass_render_event_text (GstPad * pad, GstEvent * event)
{
gint i;
gboolean ret = FALSE;
GstAssRender *render = GST_ASS_RENDER (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "received text event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate;
gint64 start, stop, time;
gboolean update;
GST_DEBUG_OBJECT (render, "received new segment");
gst_event_parse_new_segment (event, &update, &rate, &format, &start,
&stop, &time);
if (format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (render, "SUBTITLE SEGMENT now: %" GST_SEGMENT_FORMAT,
&render->subtitle_segment);
gst_segment_set_newsegment (&render->subtitle_segment, update, rate,
format, start, stop, time);
GST_DEBUG_OBJECT (render,
"SUBTITLE SEGMENT after: %" GST_SEGMENT_FORMAT,
&render->subtitle_segment);
ret = TRUE;
gst_event_unref (event);
} else {
GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL),
("received non-TIME newsegment event on subtitle input"));
ret = FALSE;
gst_event_unref (event);
}
break;
}
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
render->subtitle_flushing = FALSE;
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (render, "begin flushing");
if (render->ass_track) {
GST_OBJECT_LOCK (render);
/* delete any events on the ass_track */
for (i = 0; i < render->ass_track->n_events; i++) {
GST_DEBUG_OBJECT (render, "deleted event with eid %i", i);
ass_free_event (render->ass_track, i);
}
render->ass_track->n_events = 0;
GST_OBJECT_UNLOCK (render);
GST_DEBUG_OBJECT (render, "done flushing");
}
g_mutex_lock (render->subtitle_mutex);
if (render->subtitle_pending)
gst_buffer_unref (render->subtitle_pending);
render->subtitle_pending = NULL;
render->subtitle_flushing = TRUE;
g_cond_signal (render->subtitle_cond);
g_mutex_unlock (render->subtitle_mutex);
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_EOS:
GST_OBJECT_LOCK (render);
GST_INFO_OBJECT (render, "text EOS");
GST_OBJECT_UNLOCK (render);
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_TAG:
{
GstTagList *taglist = NULL;
/* tag events may contain attachments which might be fonts */
GST_DEBUG_OBJECT (render, "got TAG event");
gst_event_parse_tag (event, &taglist);
gst_ass_render_handle_tags (render, taglist);
ret = gst_pad_push_event (render->srcpad, event);
break;
}
default:
ret = gst_pad_push_event (render->srcpad, event);
break;
}
gst_object_unref (render);
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_ass_render_debug, "assrender",
0, "ASS/SSA subtitle renderer");
GST_DEBUG_CATEGORY_INIT (gst_ass_render_lib_debug, "assrender_library",
0, "ASS/SSA subtitle renderer library");
return gst_element_register (plugin, "assrender",
GST_RANK_PRIMARY, GST_TYPE_ASS_RENDER);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"assrender",
"ASS/SSA subtitle renderer",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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